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Lüdke, Jan; Dengler, Marcus; Sommer, Stefan; Clemens, David; Thomsen, Soeren; Krahmann, Gerd; Dale, Andrew W; Achterberg, Eric Pieter; Visbeck, Martin (2019): Influence of intraseasonal eastern boundary circulation variability on hydrography and biogeochemistry off Peru. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.903828 (dataset in review), Supplement to: Lüdke, J et al. (in review): Influence of intraseasonal eastern boundary circulation variability on hydrography and biogeochemistry off Peru. Ocean Science Discussions, 1-31, https://doi.org/10.5194/os-2019-93

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Abstract:
The Peruvian Upwelling System is characterized by high primary productivity fuelled by the supply of nutrients in a highly dynamic boundary circulation. The intraseasonal evolution of the physical and biogeochemical properties is analysed based on shipboard observations and remote sensing conducted between April and June 2017 off central Peru. The poleward transport in the subsurface Peru Chile Undercurrent was highly variable and strongly intensified between mid and end of May. This intensification was likely caused by a first baroclinic mode downwelling coastal trapped wave excited at the equator at about 95 °W that propagated poleward along the South American coast. The intensified poleward flow shortens the time of water mass advection from the equatorial current system to the study site. The impact of the anomalous advection is mostly noticed in the nitrogen cycle because during the shorter time needed for poleward advection less fixed nitrogen loss occurs within the waters. This causes a strong increase of nitrate concentrations and a decrease in the nitrogen deficit. These changes suggest that the advection caused by the coastal trapped wave supersedes the simultaneous effect of anomalous downwelling in terms of nutrient response.
Related to:
Dengler, Marcus; Czeschel, Rena; Lüdke, Jan; Krahmann, Gerd (2019): ADCP current measurements (38 and 75 kHz) during METEOR cruise M136. PANGAEA, https://doi.org/10.1594/PANGAEA.901425
Dengler, Marcus; Czeschel, Rena; Lüdke, Jan; Krahmann, Gerd (2019): ADCP current measurements (38 and 75 kHz) during METEOR cruise M137. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.904281
Stramma, Lothar; Bange, Hermann Werner; Czeschel, Rena; Krahmann, Gerd (2018): ADCP current measurements (38 and 75 kHz) during METEOR cruise M138. PANGAEA, https://doi.org/10.1594/PANGAEA.887127
Visbeck, Martin; Czeschel, Rena; Krahmann, Gerd (2018): ADCP current measurements (38 and 75 kHz) during METEOR cruise M135. PANGAEA, https://doi.org/10.1594/PANGAEA.887131
Coverage:
Median Latitude: -12.956293 * Median Longitude: -77.480478 * South-bound Latitude: -15.512000 * West-bound Longitude: -78.499500 * North-bound Latitude: -12.101500 * East-bound Longitude: -76.468200
Date/Time Start: 2017-04-12T13:11:21 * Date/Time End: 2017-05-27T17:54:56
Size:
4 datasets

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